Pulling out batteries from guitar pedal mounted to a pedal board can be a major pain in the ass. The Batt-O-Meter is here to save you another little pain in life by making that a thing of the past. Simply plug the 1/4 cable on the device into your pedal and you can measure if your Big Muff is going to die on stage AGAIN! For around $35 it’s a bit of a pricey investment to cure such a small pain, but if this is one of the great pains of your life it may well be worth it!